http://www.britannica.com/ebc/art-26/Floral-kingdoms-subkingdoms-and-major-regions-of-the-world
http://en.wikipedia.org/wiki/Ecozone
2: p4
"The genus is pantropical, extending to subtropical (or warm temperate) regions. It comprises c. 735 species, of which c. in America, c. 105 in Africa (continent, Madagascar and other Indian Ocean islands, and the Arabian Peninsula), and the others in the Asian-Australasian region; 367, including five introduced ones, occur in Malesia..."
How many in Asian-Australasian region then? 735 - 105 - 367 = 263
pantropical = occurring or distributed throughout the tropical regions of the Earth
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